dct-io 0.1.1

Read and write quantized DCT coefficients in baseline JPEG files
Documentation 
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name: CI

on:
  push:
    branches: [main, master, dev]
  pull_request:

# Cancel any in-progress run on the same branch when a new push arrives.
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true

env:
  CARGO_TERM_COLOR: always
  RUST_BACKTRACE: 1
  CARGO_INCREMENTAL: 0      # no incremental cache in CI — fresh builds only
  CARGO_NET_RETRY: 10       # retry on flaky network
  RUSTUP_MAX_RETRIES: 10

jobs:
  test:
    name: Test (${{ matrix.os }})
    runs-on: ${{ matrix.os }}
    strategy:
      fail-fast: false
      matrix:
        os: [ubuntu-latest, macos-latest, windows-latest]
    steps:
      - uses: actions/checkout@v4
      - uses: dtolnay/rust-toolchain@stable
      - uses: Swatinem/rust-cache@v2
        with:
          cache-on-failure: true   # cache even failed builds so retries are fast
      - run: cargo test --all-features
      - run: cargo run --example smoke

  msrv:
    name: MSRV (1.56)
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: dtolnay/rust-toolchain@master
        with:
          toolchain: "1.56"
      - uses: Swatinem/rust-cache@v2
        with:
          cache-on-failure: true
      # Cargo resolves dev-dependencies even for `cargo check --lib`, and
      # image 0.25 requires Rust 1.73+. Strip dev-deps before checking so
      # the resolver only sees what library consumers actually depend on.
      - name: Remove dev-dependencies
        run: |
          python3 -c "
          import re, pathlib
          t = pathlib.Path('Cargo.toml')
          t.write_text(re.sub(r'\[dev-dependencies\].*', '', t.read_text(), flags=re.DOTALL))
          "
      - run: cargo check --lib

  clippy:
    name: Clippy
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: dtolnay/rust-toolchain@stable
        with:
          components: clippy
      - uses: Swatinem/rust-cache@v2
        with:
          cache-on-failure: true
      - run: cargo clippy --all-targets --all-features -- -D warnings

  fmt:
    name: Rustfmt
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: dtolnay/rust-toolchain@stable
        with:
          components: rustfmt
      # No cache — rustfmt never compiles, so caching adds overhead with no gain.
      - run: cargo fmt --check

  doc:
    name: Docs
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: dtolnay/rust-toolchain@stable
      - uses: Swatinem/rust-cache@v2
        with:
          cache-on-failure: true
      - run: cargo doc --no-deps --document-private-items
        env:
          RUSTDOCFLAGS: -D warnings